And again, one doesn't need to speculate or assume what he meant because no matter how you interpret it, Carson was wrong.
It does increase the degree of difficulty of the dive/debate if one allows any assumption, e.g., "no matter how you interpret" - are you sure you want to go that far?
...as either he is ignorant about the science of vaccination schedules or he is simply too cowardly to totally repudiate the vaccination paranoia folks.
No other possible explanation?
I can't think of any, can you think you? I mean that honestly, not sarcastically.
One that came to mind: he recognizes that, despite the evidence of no autism, etc. link to vaccinations, some people still are afraid to vaccinate their children. Rather than choosing an offensive (e.g., "you ignorant POS, vaccinate your kids now!") approach that may feel good to say but is unlikely to achieve its desired result, he's saying "ok, spread 'em out a few weeks or so rather than all together" under the presumption that vaccinations in some reasonably short time are far better than no vaccinations at all.
This would be somewhat analogous to the "lump sum vs. dollar cost average (DCA) vs. never" approach to investing. Statistically, lump sum is best. But DCA isn't far behind lump sum and is much better than never investing. So it's best to advise people to do lump sum, but not fight about it if they prefer DCA.
Note that this may not be what Carson has in mind. Or maybe it is - we really can't tell from a 1 or 2 sentence ambiguous sound bite.